Fire pot construction



Sept. 22, 1931. w. BLAsKEwl-rz 1,824,533

FIRE Po'r CONSTRUCTION Filed Deo. 10. 1928 2 Sheets-Sheet l Sept. 22, 1931. BLAsKEwl-rz 1,824,533

FIRE POT CONSTRUCTION Filed Dec. 10. 1928 Sheets-SheetV 2 INVENToR. MAL/fw nJA/f wrz A TTORNEY.

a coil burner, burner and positioned between the top plate l Patented Sept. 2.2, 1931 UNITED STATES VP Armzr OFFICE WILLIAM BLAsKEWITz, or DETROIT, MICHIGAN, AssIGNon-'BY MEsNE ASSIGNMENTS, To CLAYTON & LAMBERT MANUFACTURING COMPANY, or DETROIT, MICHIGAN, A

CORPORATION V0F DELAWARE FIRE POT CONSTRUCTION' Applicationy led December 10, 1928. Serial No. 324;907.

This invention relates to fire pot construction, and has to do particularly with that type of fire pot having a top plate,ya fuel tank, and a `shield surrounding the and fuel tank.

Primarily due to the formationof carbon, it has been necessary with .fire potsof the type above described to remove the burner after a period of operation for either replacement or repair. Such coil burners have included a preheating coil and a burner .ele-v ment, and various arrangements' of suc-helements have been designed in .an effort to permit easy removal of the lburner without Inaterially aiileoting the compactness and strength of the firepot as a unit. One type of such fire pot structure is illustrated `in the patent to Horn No. 1,469,598 of October `2, 1923, and another type of construction `is illustrated in the application of Otto J. `Gnroehn N o. 640,191, filed May 19, 1923, now Patent No. 1,701,180, February 5, 1929.

The present invention relates lto certain improvements in fire pot construction and shield structure over the prior art, particularly as set forth in the above mentioned patent and application. .One .of the important Objects of the present invention resides ina shield which is positivelyclamped between the top plate and 7a .cup structure supported on the fuel tank, together with a single-,piece door which is hinged to the shield proper in ay novel manner,and which is also adapted t0 be held in assembled relation to the shield structure in a novel manner. f

Other features include `fthe cup construction for receiving the lower end of the shield and the manner of forming .the bottom `part ofthe hinged doorin cooperation with Athe novel form ofcup member,`whereby to positively prevent any fuel'from being deflected or passing outside of the shield member.

In the drawings:

Fig. 1 is an elevation of a fire pot 4constructed in accordance with the present invention, and showing, in particular, the assembled position of the various parts. n

Fig. 2 is a perspective view of the shield structure forsame and illustrating the :novel vthe tank.

Vstrongand `rigid casingooil burner,

manner of forming the .co-operating yhinge .elements between the shield and the door.

s Fig. Sis a'sectional viewtaken'on li-ne :3 3 .of Fig.l 2. v Fig. Llis a sectional view taken on line 4-4 `of Fig. 2. v

Fig. l5 is a sectional view taken through the .top plate of thef'iire `pot and illustratingthe Y :manneriof pinching the -top of the shield whereby to positively fix `the same against :rotation while the lire pot remains in assembled relation.

Fig-6 is .a sectional view taken on lineiG-f fof Fig. 5 and showing the V-shaped projections for pinching and vclamping the top of j the shield.

Fig. 7 isa sectional view taken through the bottom part :of 'the shield and the cup showing, in particular, the forma-tion of the bottom of the hinged door and the upperannula-r -edges'of the cup.

"The main iparts of the lire `pot structure are best illustrated in Fig. '1, wherein l represents thecombinedta-nk and base, 2 thetop plate, and 3 the shield which is clamped Vbe- :tween ithe top plate and the base. The clamping of the shield is vnot directly between the vtop plate and the base but lis .specifically between the top plate and a lcup memberfl which Sis supported and positionedbyaspider 5 `welded or `otherwise isecured .to the top of This clamping of the shield member 3 vbetween the top plate and the cup insures a very and such rigid lconstruction is in direct Icontrast with shieldstructures which are :merely suspended to one member, such as .the .top plate and do not have any support or reinforcement for the otherend. The

clamping of the 4-shield kkmember'is, of course, accomplished Vby tighten-ing` of athe bolts-fon the 'end-s of the rodsybut 'it w'll be obvious .that many :blows may be accidentally :received by the shield member, and that the reinforcing and `clamping vof 'they 'same w'i-ll effectively :protect the coil burner.

' The `coifl burner Ina-y be generally designated-7 4and is preferably connected 'to an upstanding conduit 8 which 'in 'turn is con for protecting the upwardly ing upwardl nected to a suitable valve 10 by means of the union 11. To provide for removal of the entire burner unit, including the coil burner 7 and the conduit 8, I have provided a hinged door 12 which is secured to the remainder of the shield in a novel manner.

This door 12 is preferably slotted as at 13 to receive similarly positioned lugs 14 which are rolled over, as best shown in Fig. 3,'to form a hinged member'or eye surrounding the portion of the door between the slot 13 and the edge thereof. In other words, the

in for hinging the door is merely a portion of the door itself and the hinge for receiving the pin is merely formed by a bent overportion of the shield body.

The hinged door 12 is adapted to be held in closed position by means of a. lug 15 stamped out of the shield member and bent and outwardly at substantially right angles to the normal of the shield at that point. This lug is so stamped out as to extend upwardly and outwardly at an angle Vwhen it is bent out at right angles to the shield, as best shown in Fig. 2. t The slots 13 are preferably longer than the hinged members 14 whereby the door may be slightly lifted when it is closed, whereby the slot 16 in the door may cooperate with the lug 15 of the shield body. However, the lug 15 is preferably so positioned as to present the face 18 which is adapted to frictionally engage portions of the slot 16 so as to hold the door closed by reason of the friction between the parts.

The cup 4 is preferably fabricated so as to `present an annular ring 19 and an annular upstanding flange V20, the flange 2O extendy to a greater height than the ring 19. The lower edges of the shield body fit in the groove between the annular ring 19 and the upstanding flange 20, but the door 12 is preferably shorter than the shield body, as best shown inFig. 2.v

Ay portion of the lower edge of the door is preferably turned inwardly at the bottom so as to form a horizontal inwardly eX- tending flange 21, which is so positioned as tovjust barely clear the upper edge of the flange 20. It will thus be seen thatany liquid fuel forced from the burner in starting the apparatus and striking the hinged door will be positively prevented from flowing or dripping outside of the cup and onto the top of vthe tank 1. l

The lower edge of the main body of the shield fitting in the upper groove of the cup 4, it will be obvious that any liquid fuel flowing down the inside of the shieldl will be collected-by the cup. As the outlet from the vburner, element is usually directed upwardly it will be obvious that without these positive arranged elements that it will be very easy .for lsome of the liquid fuel to How or drip von tothe fuel tank. Y

The hinged door 12 is also provided with a suitable stamped out handle 22 which makes it easy to open the door 12 to permit removal of the burner structure. It will furthermore be obvious that the pinching of the shield member to prevent rotation of the same will insure maintenance of the door 12 in same position whereby the burner structure may always be easily removed. The top loop connecting` the coil burner with the upstanding conduit 8 is normally adapted to t within la suitable opening formed by cooperating out away parts 23 and 24 in the shield and door respectively.

It will thus be obvious that I have provided a shield member of very compact simple and novel construction and which is so adapted to be clamped between the top plate and the base of the lire pot as to greatly reinforce the fire pot structure as a whole, in addition to serving as a spacing means between the top plate and the fuel tank, the fabrication of the shield and door members being such that the hinging and closure retainer means are fabricated from the members themselves whereby to present an eX- tremely simple, inexpensive and elhcient arrangement. Y

The shield is clamped between the top plate 2 and the cup member 4. The top plate 2 has a circumferential groove 30 (Figs. 5 and 6) Which contains-the spurs 31 which ar arranged to dig into the upper edge of the burner shield 3 to hold the same non-rotatively.

What I claim is:

1. In a fire pot, a tank, a top plate, a cup member positioned at thetop of said tank and provided with an annular groove at its upper edge, a burner positioned between the top plate and said cup member, and a shield surrounding said burner and spacing the top plate from said cup member, the lower edge of a portion of said shield Eltting in the said groove in the cup member, and said shield being clamped between the top plate and cup member by clamping means directly connecting the tank and top plate, a portion of said shieldmember being of less height than the remainder of the shield and being hinged to the shield body whereby to permit removal of the burner laterally through the shield without disturbing the remaining elements of the fire pot.

2. In a tire pot of the class described, a tank, a burner, a top plate having a groove formed in the lower surface thereof, a cup supported on the tank and having a groove formed in the upper surface thereof, the outer edge of said groove being higher than the inner edge, and a shield member sutrrounding the fire `pot burner and clamped between the top plate and tank whereby a portion of said-shield member kfits in the respective grooves of said top plate and cup member, means formed in said top plate for i gripping the upper edge of said shield when the parts are assembled whereby to prevent rotation of said shield, and a hinged door completing the contour of said shield and being of less height thanthe shield body proper whereby it may swing freely. v Y

3. In a fire pot of the class described, va tank, a burner, a topplate having a groove formed in the lower surface thereof, va cup supported on the tank and having a groove formed in the upper surface thereof, the outer edge of said groove being higher than the inner edge, and a shield member surrounding the fire pot burner and clamped between the top plate and tank whereby a portion of said shield member ts inrtherespective grooves of said top plate and cup members, means formed in said top plate for gripping the upper edge of said shield when the parts are assembled prevent rotation of said shield, and a hinged door completing thev contour of said shield and being of less height than the shield body proper whereby it may swing freely, the lower edge of said door being bent inwardly to provide a flange which ext-ends past lthe outer portion of the groove in said cup member, whereby yto deiect any liquid fuel hitting the door downwardly into the cup member.

In testimony whereof I aiX my signature.

WILLIAM BLASKEWITZ.

whereby to 

